I have a one block high breeze block wall ( concrete block - whatever they are called) around the garden. I need to remove one block to allow the water to drain into the garden ( been this way for years but the post man has decided to complain about it) . I tried knocking it out with a sledge hammer this morning but it wont budge. Is there a knack to this or is it just brute force? The wall is about fifty years old.
Thanks.